| 123 Utleie AS | Wholesale & retail | 2022 |
| 3CB Holding AS | | 2026 |
| Abe Trafikkskole AS | Education | 2020 |
| Abelsen Media AS | Arts & recreation | 2021 |
| Afghan Catering AS | Hospitality | 2021 |
| Akershus Boligbygg AS | Real estate | 2014 |
| Akershus Konsulent- Og Utleie Service AS | Professional & scientific | 2018 |
| Akershus Renhold AS | Administrative & support | 1986 |
| Aksel Renhold AS | Administrative & support | 2011 |
| Alf Marketing AS | Professional & scientific | 2015 |
| Alfa Hundeskole Ans | Other services | 2005 |
| Almvik Holding AS | | 2021 |
| Aloft AS | | 2020 |
| Amiri Bygg AS | Construction | 2025 |
| Ampo Holding AS | Education | 2014 |
| Andreas Jonsson AS | Information & communication | 2018 |
| Androbe Robotics AS | Wholesale & retail | 2022 |
| Anny Isabella AS | Arts & recreation | 2021 |
| Aol Automotive Import & Trading AS | Wholesale & retail | 2020 |
| Aqula AS | Agriculture & fishing | 2017 |
| Aqula I AS | Agriculture & fishing | 2021 |
| Aqula II AS | Real estate | 2021 |
| Araf Enterprises AS | | 2025 |
| Ari Storkjøkken AS | Wholesale & retail | 2026 |
| Arnor Jenssen Eiendom AS | Real estate | 2018 |
| Aron Transport AS | Transport & logistics | 2020 |
| Arresø AS | Professional & scientific | 2006 |
| Artige Innslag AS | Arts & recreation | 2004 |
| AS Fringilla | Professional & scientific | 1986 |
| AS2 Holding AS | Administrative & support | 2018 |
| At Bil AS | Wholesale & retail | 2011 |
| Aul Bryggerlaug SA | Wholesale & retail | 2015 |
| Autoluxe AS | Wholesale & retail | 2016 |
| Aviga AS | Administrative & support | 2022 |
| Awan Company AS | Health & social care | 2020 |
| Bakken Opp AS | Wholesale & retail | 2023 |
| Bakken-Nilsen Invest AS | Financial services | 2016 |
| Balder Programvare AS | Information & communication | 1989 |
| Baron Eiendom AS | Real estate | 2021 |
| Bas Vision AS | Professional & scientific | 2025 |
| Bastant Invest AS | | 2021 |
| BD Konstruksjon AS | Construction | 2022 |
| Beauty Box AS | Wholesale & retail | 2021 |
| Bekkehagan 4 AS | Real estate | 2020 |
| Bella Sacci AS | Professional & scientific | 2025 |
| Belleye AS | Wholesale & retail | 2024 |
| Belt- Produkter AS | Professional & scientific | 2003 |
| Bendikas Tjenester AS | Administrative & support | 2020 |
| Bens Rørleggerservice AS | Construction | 2012 |
| Berg Byggservice AS | Construction | 2012 |
| Berghagan Næringsutvikling AS | Real estate | 2014 |
| Bergvill Holding AS | Professional & scientific | 2023 |
| Best Mark AS | Wholesale & retail | 2000 |
| BG30 Eiendomsmegling AS | Real estate | 2017 |
| Bik Service AS | Construction | 2020 |
| Bikuben Hobby AS | Wholesale & retail | 2020 |
| Biliv AS | | 2023 |
| Bilkar AS | Professional & scientific | 2026 |
| Bilvalg AS | Wholesale & retail | 2025 |
| Bimm Norway AS | Information & communication | 2016 |
| Birdflow AS | Real estate | 2026 |
| Bjorinvest AS | Professional & scientific | 2016 |
| Bjørks Bygg & Konstruksjon AS | Construction | 2017 |
| Bjørn Jacobsen Trading AS | Wholesale & retail | 2006 |
| BKS Capital AS | Real estate | 2012 |
| Blaakollen Håndverk AS | Construction | 2013 |
| Bodzio Byggetjenester AS | Construction | 2012 |
| Bohasi Invest AS | Financial services | 2008 |
| Boligbygg Utleie AS | Real estate | 2018 |
| Boligparkering AS | Real estate | 2018 |
| Boligutvikling Eiendom AS | Real estate | 2013 |
| Boligutvikling Frogner AS | Real estate | 2013 |
| Boligutvikling Norge AS | Real estate | 2013 |
| Borken AS | Real estate | 2007 |
| Brainbase AS | Professional & scientific | 2017 |
| Brainbase Brigade AS | Information & communication | 2024 |
| Brannorden AS | | 2026 |
| Brogaarden AS | Real estate | 1968 |
| Brogaarden Frisørstudio Da | Other services | 1996 |
| Buer Invest AS | Real estate | 2005 |
| Bugge Bussreiser AS | Transport & logistics | 2008 |
| Buraas Bygg AS | Construction | 2020 |
| Buss Og Reiseservice AS | Administrative & support | 2005 |
| Bussholding AS | Transport & logistics | 2024 |
| BVS IT AS | Information & communication | 2021 |
| By Lilly Holding AS | Professional & scientific | 2023 |
| Bygg M/J AS | Construction | 2025 |
| Byggvenn AS | Real estate | 2022 |
| BYRÅ24 AS | Other services | 2021 |
| Bærum Glassmesterforretning AS | Construction | 2018 |
| Bærumsveien 300 Eiendom AS | Real estate | 1989 |
| C-Optikk Skårer AS | Wholesale & retail | 2012 |
| Calibra AS | Information & communication | 1996 |
| Captain Holding AS | | 2025 |
| Captivia Finans AS | Professional & scientific | 2011 |
| Carlot AS | Real estate | 2006 |
| Carlot Drift AS | Real estate | 2019 |
| Carlot Eiendom AS | Real estate | 2016 |
| Carlot Industri AS | Real estate | 2021 |
| Castravet Kran & Transport AS | Transport & logistics | 2026 |